I just got my new in-hull (not thru-hull) depth sounder and the instructions say I need to feel the base with 2.4fl oz of propylene glycol....
I did a google on this and there is a lot of info on it as a safe to handle/ingest product for many uses but no good source that I can find... the local hardware store doesn't have it and west marine (who delivered the transducer is another $30 cab ride away, if they even have it)... any one know of a product name for this stuff... or an alternate fluid to use in the depth sounder mount?
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